Four Lever Offset Shutoff Butterfly Valves, Perfect for Fluid Handling Solutions

• Customization: Available
• Media: Gas
• Driving Mode: Pneumatic
• Model NO.: AOC-430
• Connection Form: Flange
• Structure: Eccentric
• Seal Form: Supercharging Pressured Sealed
• Valve Stem: Link
• Work Pressure: High Pressure (10.0mpa< Pn <80.0mpa)
• Working Temperature: High Temperature (T>450°C)
• Material of Seal Surface: Soft Sealed
• Standard: Sil/API
• Application: Industrial Usage, Water Industrial Usage
• Design Standard: Ap1598API607asmeb16.34
• Standard Size: Nps12-160"(DN300-DN4000)
• Pressure Class: Pn2.5-Pn20/Asmeclass150
• Applicable Temperature: -20 Degree ~ 800 Degree
• Leakage Class: Ansib16.104VI, API598 No Leakage
• Body Material: Astma105A351CF8m/Special Alloy, etc.
• Valve Internals Material: A479-316/S2205/17-4pH
• Operation Mode: Manual, Pneumatic/Electric/Electro-Hydraulic, E
• Design: Anti-Static Design/Anti-Misoperation Design
• Sealing Structures: Multiple Sealing Structures for Option
• Valve Special Treatment: Sand Blasting Surface Treatment SA2.5
• Special Treatment: Painting After Surface Treatment
• Sealing Surface of Valve Plate: Hard Alloy Surfacing
• Valve Body Treatment: Sandblasted Inside and Outside
• Fire Protection Design: API607
• Transport Package: Wooden
• Trademark: SNT
• Origin: China
• HS Code: 8481804090
• Production Capacity: 500000PCS/Year

Product Description

About SNT Butterfly Valves

In recent years, With the improvement of industry and the requirements of energy conservation and environmental protection policy, the cut-off butterfly valve has been more and more widely used. In the prior technology, the tri-eccentric butterfly valve belongs to torque sealing, and the valve plate is closed more tightly by the torque of the actuator to achieve the sealing effect. However, in some special occasions (such as high temperature catalytic flue gas, gas, sulfur tail gas and other media, the temperature reaches 800°C), due to the existence of thermal expansion stress, the valve will not be able to open, easy to cause serious consequences such as tri-eccentric butterfly valve stuck, affecting industrial production, causing huge economic losses, and even cause safety accidents.


SNT VALVE is specialized in the research of high temperature flue gas device butterfly valve. For the above problems, SNT VALVE proposed to use four-stem eccentric butterfly valve instead of tri-eccentric butterfly valve and aeration butterfly valve as a solution in the industry for the first time, successfully solved the problem for many years, applied for two national patents: a four-stem eccentric butterfly valve (patent No.: ZL201520326489.1 and catalytic device with four-stem eccentric butterfly valve (patent No.: ZL201921719624.3), and commissioned China Petroleum and Chemical Industry Federation wot conduct product identification with Changzhou University, which was awarded as the domestic leader.

<sup>Four-link Eccentric Butterfly Valve Application

The AOC-4000 series four-link eccentric butterfly valve, designed by SNT, is widely used as a special condition regulating and shut-off valve.
Introducing the AOC-4000 series, a cutting-edge four-link eccentric butterfly valve designed specifically to excel in demanding environments. This marvel is crafted for scenarios requiring high-temperature endurance, large-diameter adaptability, high-flow efficiency, and minimal pressure drop. It boasts superior low-leakage and zero-leakage functionalities. Experience flawless planar sealing that prevents valve jamming even at elevated temperatures. Enjoy rapid opening and closing mechanisms, precise adjustment capabilities, and unmatched sealing reliability. This valve is an ideal choice for regulating or cutting off pipeline media, particularly in the production processes of phthalic anhydride and maleic anhydride. Versatile in application, it adeptly controls diverse gases and liquids such as hydrogen, ammonia, air, smoke, and gas within pipeline systems. For media prone to crystallization, like sulfur, a specialized jacketed structure is available, effectively preventing pipeline blockages due to cooling and condensation.

The AOC-4000 series four-link eccentric butterfly valve is typically outfitted with a cylinder-type single-acting actuator. However, for specific needs, you have the flexibility to choose from cylinder-type double-acting actuators, as well as electric or hydraulic actuators. This ensures seamless adaptability, with a remarkable minimum shut-off time ranging from just 2 to 6 seconds, delivering swift and efficient operation.</sup>




Working Principle

^{The ingenious design of the four-link butterfly valve revolves around its core components: a drive device, valve plate, valve body, valve shaft, linkage system, and shaft end seals. The drive device instigates the movement of the valve shaft and the four-link mechanism, orchestrating the opening and closing of the valve. As the valve shaft rotates, the valve plate opens, aligning parallel to the pipeline center for a fully open position. Conversely, the valve plate closes with reverse rotation, engaging and compressing the valve body's sealing surface to achieve a fully closed state. This precise and reliable mechanism ensures optimal functionality and performance.}

Product Specifications

Body: Constructed with superior-grade materials, the body of our Four Lever Offset Shutoff Butterfly Valves offers unmatched durability and resilience, making it a cornerstone of efficiency in fluid management applications.

Type	Four Lever Offset Buterfly Valves
Body Size	NPS 6-64''(DN 150-DN 1600)
Disc Form	Four Lever Eccentric
Flow to	Flow into the shaft side
Characteristics	Liner/On-off
Trim material/Trim treatment	See valve material table
Body ratings	ASME B16.34 ANSI 150
Body Connections	·ANSI, EN Double Flanged ·ANSI B16.25 ·API 609 Single Flange-Lug Type
Face to Face Dimension	See valve overall size
Range ability	Over 100:1(See Cv coefficients table)
Bonnet Type	Standard -29 degree Radiation fin -55 degree-566 degree Cryogenic -196 degree-55 degree
Packing	PTFE flexible graphite
Leakage Class	According to API 598 Zero Leakage

 

Design Features

^{• Crafted to perfection, the maximum diameter of our connecting valve body impressively extends up to DN4000, ensuring unparalleled versatility and adaptability.
• Boasting a revolutionary unique four-stem structure design with a sophisticated flat seal design, this valve is engineered for excellence.
• Innovative external double bearing design adeptly prevents medium ingress into the bearing, effectively eliminating blockages.
• Ingenious drain valve safeguards against medium corrosion, enhancing durability and reliability.
• Withstanding the heat, our high temperature design endures up to an impressive 800 ºC
• Engineered with API607 Fire Protection Design, ensuring top-notch safety standards.
• Robust integral stem design with an anti-center shaft out mechanism for unmatched stability.
• Reliable anti-static design ensures safe and efficient operation.
• Ingenious anti-misoperation design for enhanced operational safety.
• Flexibility in sealing with multiple sealing structures available for customization.
• Sturdy fabricated construction for enhanced performance and longevity.
• Embodying precision, the disc glides parallel to the body seat during initial opening and final closing stages, delivering a seamless, friction-free motion.
• Diverse seat arrangement options cater to a myriad of operational needs, ensuring optimal performance.}
 

Product Range

^{★ Design Standard Refinement: AP1598, API607, ASME B16.34 - Ensuring Excellence and Compliance
★ Standard Size Versatility: NPS 12-160" (DN300-DN4000) - Tailored for Diverse Applications
★ Pressure Adaptability Class: PN2.5-PN20 / ASME CLASS 150 - Optimized for Performance
★ Applicable Temperature Range: -20°C ~ 800°C - Robust for Extreme Conditions
★ Leakage Class: ANSI B16.104 VI, API 598 - Precision in Sealing No Leakage
★ Body Material Excellence: ASTM A105, A351 CF8MSpecial Alloy Options Available
★ Valve Internals Material: A479-316; S2205; 17-4PH - Engineered for Durability
★ Operation Mode Flexibility: Manual, Pneumatic, Electric, Electro-Hydraulic, and More
★Product Range Customization Possible to Meet User Requirements}

Valve Special Treatments

<sup>• Premium Sand Blasting Surface Treatment SA2.5
1. The valve body undergoes meticulous sandblasting, both inside and out, ensuring superior surface preparation.
2. Achieve an impeccably fine surface post-sandblasting, enhancing paint adhesion to provide robust protection.
3. If the oxygen content within the medium reaches over 23.5%, only external sandblasting is necessary, foregoing the interior treatment.•</sup>

<sup>• Expert Painting after Surface Treatment
1. Our standard painted surfaces endure temperatures up to 450°C, with custom treatments available for higher heat.
2. Two protective coats of paint, each 35 micrometers thick, are applied to shield against corrosion effectively.

• Advanced Hard Alloy Surfacingon Sealing Surface ofValve Plate
a) The sealing surface of the valve plate can be fortified through welding with Hastelloy or Stellited gr.6,
b) Tungsten carbide and other hard alloy spraying options elevate hardness to an impressive HRC60-70.</sup>
 

Typical Product Application

Sulfur Tail Gas Recovery

SINOCHEM GROUP Petrochemical Incineration Boiler Crossover Connectionstem Butterfly Valve (An essential component in fluid control engineering)The right figure is used effectively in product applications after 4 years)

Petro China 270,000 tons/year sulfur tail gas standard project, a hallmark of excellence

catalytic flue gas turbine outlet butterfly valve, a superior alternative to water seal tanks

Comparison of SINOPEC catalytic flue gas turbine outlet to cutting-edge heat recovery boiler site configurations

Images from the scene of SINOCHEM GROUP Refining and Chemical Industries catalytic flue gas turbine outlet applications to chimney, ensuring environmentally sound emissions

 

Production application

 

 

 

 

 

Company Profile

<sup>SNT Machinery (Qingdao) Co., Ltd. is an esteemed producer of superior control valves, seamlessly integrating manufacturing, design, sales, and service into a cohesive powerhouse. With our origins firmly rooted in a high starting point, SNT has experienced rapid development. Nestled in the vibrant city of Qingdao, Shandong province, our expansive 42,000m2 facility is home to state-of-the-art workshops and cutting-edge production equipment. As a distinguished high-tech enterprise, we boast independent intellectual property rights and have imported advanced management and production expertise from global leaders. Our dedicated team of over 150 professionals includes a remarkable 15% R&D specialists, with 30% holding graduate or higher degrees. Leveraging our exceptional production management team and pioneering R&D efforts, we manufacture an impressive array of high-quality valves utilized extensively in the petrochemical, oil, and coal chemical industries. In 2017, our sales soared to nearly 100 billion, marking a significant milestone in our growth journey.

SNT proudly holds the TS special equipment manufacturing certificate and ISO 9001 certification, alongside securing the net qualification certificate from industry giants SINOPEC, CNOOC, PETROCHINA, and SINOCHEM. Moreover, our innovative prowess has been recognized with numerous National Patents across various technologies. We excel in designing and manufacturing a comprehensive range of valves adhering to ANSI, API, DIN, BS, and JIS standards. By blending the advantages of renowned valves worldwide with our independent R&D, we offer an extensive portfolio, including GLOBE Valves, High Pressure Boiler Blow-down Valves, and High-performance Butterfly Valves. Our offerings also encompass Angle-regulating Valves, Eccentric Rotary Valves, Three-eccentric Center Butterfly Valves, and V Ball Valves, alongside High Wear-resistant Ball Valves, High Pressure Steam Valves, Micro-flow Control Valves, Self-operated Control Valves, and Cryogenic Valves. The driving forms we provide include manual operation, power-driven, pneumatic, and hydraulic drive, with main parts crafted from materials such as A216 WCB, A217 WC6/WC9, and A351 CF8/CF8M/CF3/CF3M, among others. Our specifications range from 1/2" to 120", accommodating working pressures of ANSI 150# to 2500# and temperatures from -196ºC to 1100ºC.

Leveraging our advanced production technology and stringent quality assurance systems, SNT Valves have become integral components in the petrochemical, oil, steel & iron, paper manufacturing, and power station industries. Our esteemed clientele includes notable names such as SINOPEC QILU branch, SINOPEC Qingdao branch, CNOOC Huizhou Refinery, PETROCHINA Guangxi branch, and PETROCHINA Ningxia branch. Additionally, we proudly serve SINOPEC Changling branch, Jinan branch, among others, underscoring our widespread impact and trusted reputation across these critical industries.

At SNT, we prioritize our users' profits, dedicating ourselves to establishing an unrivaled standard of excellence and a reputable brand. Our comprehensive quality assurance and robust after-sales systems ensure that SNT Valves forge strong partnerships with our customers, paving the way to mutual prosperity and success.</sup>